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Line profile analysis and rocking curve evaluation of 3D diffraction data reveal a strain softening mechanism
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SYSNO ASEP 0558299 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Line profile analysis and rocking curve evaluation of 3D diffraction data reveal a strain softening mechanism Author(s) Farkas, Gergely (UJF-V) RID, ORCID, SAI
Bhattacharyya, J. (US)
Levytska, Olena (UJF-V) SAI, ORCID
Zilahi, G. (HU)
Mathis, Kristián (UJF-V) ORCID
Agnew, S. R. (US)Number of authors 6 Article number 117993 Source Title Acta Materialia. - : Elsevier - ISSN 1359-6454
Roč. 233, JUL (2022)Number of pages 15 s. Publication form Print - P Language eng - English Country GB - United Kingdom Keywords Synchrotron diffraction ; Line profile analysis ; Rocking curve analysis ; Single grain diffraction ; Deformation mechanisms OECD category Materials engineering R&D Projects LM2018111 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Limited access Institutional support UJF-V - RVO:61389005 UT WOS 000799067500006 EID SCOPUS 85129862146 DOI 10.1016/j.actamat.2022.117993 Annotation Diffraction patterns from & SIM,100 individual grains of a solutionized and quenched metastable beta-Ti alloy were obtained by high energy synchrotron diffraction during in-situ tensile deformation experiments. The diffraction patterns of select grains were analyzed per an established single-crystal line profile analysis technique to assess the dislocation density evolution on individual slip systems. Further, a new technique to estimate the geometrically necessary dislocation (GND) density from rocking curves is introduced. The results provide a powerful complement to previously published comparisons between measured and crystal plasticity simulated internal elastic strains (and stresses). In particular, they reveal there is no preference for 1/2 111 Burgers vector dislocations to reside on a particular glide plane, since they have similar densities on {1101 and {1121 planes. In addition, an explanation for the observation of strain softening in some of the grains is hypothesized as form of 'plastic buckling'. A select number of strain softening grains exhibit higher lattice curvature (GND density) than other grains, indicating that the grains have 'broken up' into smaller domains which are deforming in distinct ways from one another, and more easily than they would have together. On the other hand, no significant differences in total dislocation density increment were observed, and examination of diffraction data from a larger subset of grains shows no strong correlations between total or GND densities with hardening/softening behavior. The results of this study reveal that GND density does not correlate with higher grain-level stress or more rapid strain hardening response. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2023 Electronic address https://doi.org/10.1016/j.actamat.2022.117993
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